TDD stands for Test Driven Development it is a development methodology where you write unit tests before you write your actual code. Wikipedia defines it as:
Test-Driven Development (TDD) is a software development technique consisting of short iterations where new test cases
covering the desired improvement or new functionality are written
first, then the production code necessary to pass the tests is
implemented, and finally the software is refactored
to accommodate changes. The availability of tests before actual
development ensures rapid feedback after any change. Practitioners
emphasize that test-driven development is a method of designing software, not merely a method of testing.
In its simplest form it is a way to develop software that allows your code to be completely tested and testable to limit bugs later on.
I have made several posts on TDD please check them out below.
General Posts on TDD
TDD (Test Driven Development) for beginners
More on TDD "so much code"
